Apple Releases Safari Technology Preview 221 With Bug Fixes and Performance Improvements - MacRumors
Skip to Content

Apple Releases Safari Technology Preview 221 With Bug Fixes and Performance Improvements

Apple today released a new update for Safari Technology Preview, the experimental browser that was first introduced in March 2016. Apple designed ‌Safari Technology Preview‌ to allow users to test features that are planned for future release versions of the Safari browser.

Safari Technology Preview Updated Feature 1
‌Safari Technology Preview‌ 221 includes fixes and updates for Accessibility, Forms, JavaScript, Media, PDF, Rendering, Web API, Web Inspector, and WebRTC.

The current ‌Safari Technology Preview‌ release is compatible with machines running macOS Sequoia and macOS Tahoe, the newest version of macOS that's set to launch this later this year.

The ‌Safari Technology Preview‌ update is available through the Software Update mechanism in System Preferences or System Settings to anyone who has downloaded the browser from Apple's website. Complete release notes for the update are available on the Safari Technology Preview website.

Apple's aim with ‌Safari Technology Preview‌ is to gather feedback from developers and users on its browser development process. ‌Safari Technology Preview‌ can run side-by-side with the existing Safari browser and while it is designed for developers, it does not require a developer account to download and use.

Popular Stories

Safari Technology Preview Updated Feature 1

Apple Releases Safari Technology Preview 242 With Bug Fixes and Performance Improvements

Thursday April 23, 2026 1:59 pm PDT by
Apple today released a new update for Safari Technology Preview, the experimental browser that was first introduced in March 2016. Apple designed Safari Technology Preview to allow users to test features that are planned for future release versions of the Safari browser. Safari Technology Preview 242 includes fixes and updates for Accessibility, CSS, Forms, HTMl, Images, JavaScript, Media,...
Safari Technology Preview Updated Feature 1

Apple Releases Safari Technology Preview 243 With Bug Fixes and Performance Improvements

Thursday May 7, 2026 2:03 pm PDT by
Apple today released a new update for Safari Technology Preview, the experimental browser that was first introduced in March 2016. Apple designed Safari Technology Preview to allow users to test features that are planned for future release versions of the Safari browser. Safari Technology Preview 243 includes fixes and updates for Accessibility, Animations, CSS, Editing, Encoding, Forms,...
Apple Event Logo

Apple Just Released a New Accessory

Monday May 4, 2026 8:13 am PDT by
Apple today released a new Pride Edition Sport Loop for the Apple Watch. The band features a rainbow design with 11 colors of woven nylon yarns. The new Pride Edition Sport Loop is available to order now on Apple.com and in the Apple Store app in 40mm, 42mm, and 46mm sizes, and it will be available at Apple Store locations starting later this week. In the U.S., the band costs $49. There...

Top Rated Comments

Adora Avatar
12 months ago

I mean the new features in these Safari previews.
There are always new experimental features in Safari's advanced settings that you can turn on. I just saw now it's called "WebKit Feature Flags".

The scroll bar in the last screenshot indicates how much more there is... ;)



Attachment Image

Attachment Image

Attachment Image

Attachment Image

Attachment Image
Score: 1 Votes (Like | Disagree)
It’s always something Avatar
12 months ago
Do these things ever make their way to iOS/iPadOS? If so, I think Safari should be disentangled from OS updates so that we can enjoy these new features on a more regular basis.
Score: 1 Votes (Like | Disagree)